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cos(π/n)cos(2π/n)cos(3π/n) ... cos(nπ/n) = ?
Author:
羅驥韡 (Pegasus Roe)
Topic:
Complex Numbers
GeoGebra
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球體建築師
兩組對邊相等的四邊形
三位數除以一位數（一）
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
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三角形的兩邊中點連線
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